排序方式： 共有58条查询结果，搜索用时 15 毫秒
31.
The purpose of this study was to compare the effects of pre-exercise ice slurry ingestion and cold water immersion on submaximal running time in the heat. On three separate occasions, eight males ran to exhaustion at their first ventilatory threshold in the heat (34.0 ± 0.1 ° C, 52 ± 3% relative humidity) following one of three 30 min pre-exercise manoeuvres: (1) ice slurry ingestion; (2) cold water immersion; or (3) warm fluid ingestion (control). Running time was longer following cold water immersion (56.8 ± 5.6 min; P = 0.008) and ice slurry ingestion (52.7 ± 8.4 min; P = 0.005) compared with control (46.7 ± 7.2 min), but not significantly different between cold water immersion and ice slurry ingestion (P = 0.335). During exercise, rectal temperature was lower with cold water immersion from 15 and 20 min into exercise compared with control and ice slurry ingestion, respectively, and remained lower until 40 min (P = 0.001). At exhaustion rectal temperature was significantly higher following ice slurry ingestion (39.76 ± 0.36 ° C) compared with control (39.48 ± 0.36 ° C; P = 0.042) and tended to be higher than cold water immersion (39.48 ± 0.34 ° C; P = 0.065). As run times were similar between conditions, ice slurry ingestion may be a comparable form of pre-cooling to cold water immersion. 相似文献
32.
Orit Avidov-Ungar Roni Reingold 《International Journal of Leadership in Education》2018,21(3):293-309
In Israel, the Ministry of Education determines all aspects of educational policy, including teachers’ initial teacher education, licensing and professional development. As part of the New Horizon educational reform, the Ministry announced in 2010 a new plan for the professional development of teachers in Israel. The Ministry assigned a mediating role to its district managers and superintendents, placing them in charge of introducing and implementing this policy. The current study describes the findings of a qualitative, narrative-based research, which examined the attitudes of 25 Ministry of Education district managers and superintendents regarding the implementation of the new professional development policy. Interviewees noted both the major advantages of this policy, e.g. organizing the professional development process and including all of the teachers, as well as its many disadvantages, e.g. overburdening the teachers, the lack of high-quality teacher trainers, etc. This study sheds light on the process of implementing a top-down reform in teachers’ professional development. Moreover, it sheds light on the main tasks of superintendents as educational leaders. 相似文献
33.
Josefa León-López Carmen Calderón-Soto Matías Pérez-Sánchez Belén Feriche Xavier Iglesias Diego Chaverri 《European Journal of Sport Science》2018,18(6):832-841
Using a controlled parallel group longitudinal trial design, we investigated the effects of different training interventions on the prooxidant/antioxidant status of elite athletes: living and training at moderate altitude for 3 (Hi-Hi3) and 4 weeks (Hi-Hi), and for 4 weeks too, living high and training high and low (Hi-HiLo) and living and training at sea level (Lo-Lo). From 61 swimmers, 54 completed the study. Nitrites, carbonyls, and lipid peroxidation (LPO) levels were assessed in plasma. Enzymatic antioxidants glutathione peroxidase (GPx) and glutathione reductase (GRd), and non-enzymatic antioxidants total glutathione (GST), reduced glutathione (GSH) and oxidized glutathione (GSSG) were analysed in the erythrocyte fraction. At the end of the intervention, nitrites levels were similar in all altitude groups but higher than in the Lo-Lo controls (P?=?.02). Hi-HiLo had greater GPx activity than Hi-Hi and Hi-Hi3 during most of the intervention (P?≤?.001). GRd activity was higher in Lo-Lo than in Hi-Hi at the end of the training camp (P?≤?.001). All groups showed increased levels of LPO, except Lo-Lo, and carbonyls at the end of the study (P?≤?.001). Training at altitude for 3 or 4 weeks drives oxidative stress leading to cellular damage mainly by worsening the antioxidant capacities. The GSSG/GSH ratio appears to be related to perceived exertion and fatigue. The stronger antioxidant defence showed by the Hi-HiLo group suggests an inverse relationship between redox alterations and performance. Further studies are required to investigate the role of oxidative stress in acclimatization, performance, and health. 相似文献
34.
35.
Gui-Yuan Shi Yi-Xiu Kong Guang-Hui Yuan Rui-Jie Wu An Zeng Matúš Medo 《Journal of Informetrics》2019,13(2):717-725
Identifying the future influential papers among the newly published ones is an important yet challenging issue in bibliometrics. As newly published papers have no or limited citation history, linear extrapolation of their citation counts—which is motivated by the well-known preferential attachment mechanism—is not applicable. We translate the recently introduced notion of discoverers to the citation network setting, and show that there are authors who frequently cite recent papers that become highly-cited in the future; these authors are referred to as discoverers. We develop a method for early identification of highly-cited papers based on the early citations from discoverers. The results show that the identified discoverers have a consistent citing pattern over time, and the early citations from them can be used as a valuable indicator to predict the future citation counts of a paper. The discoverers themselves are potential future outstanding researchers as they receive more citations than average. 相似文献
36.
Marielle L. J. Le Mat 《Sex education》2017,17(4):413-424
Comprehensive sexuality education which includes discussion about gender and power is increasingly seen as an effective way of promoting sexual and reproductive health and rights. Yet all too often the potential of good quality sexuality education is not realised. This study engages with young peoples’ evaluation of a sexuality education programme in Ethiopia. Using data from ethnographic field notes, focus group discussions and interviews with students, teachers and sexual and reproductive health workers in Oromia region, it reveals the existence of gendered practices in sexuality education. Three forms of exclusion were evident: first, exclusion through selection to participate in the programme; second, exclusion of the views of young people through gendered interpretations and practices; third, exclusion of the views of young people through the omission of discussion on topics that are relevant to them, such as love, relationships and sexual intercourse. As a result, the programme’s potential to contribute to questioning gender relations and improving the emotional and sexual health of young people is undermined. The programme reproduces a gender order in school and arguably broader society, which is a source of frustration and alienation for young people. 相似文献
37.
38.
Specific learning disabilities 总被引：1，自引：1，他引：0
Zdeněk Matějček Ph.D. 《Annals of dyslexia》1977,27(1):7-25
39.
Saiyidi Mat Roni 《Public Library Quarterly》2017,36(4):334-348
We explore the role that devices currently play in children’s book reading, finding that while children have relatively high access to devices with eReading capability, these devices are underutilised for reading purposes. While ownership of devices was negatively associated with reading frequency for both genders, its negative impact was more significant for girls than boys. We also found that when boys and girls identified themselves as daily readers, and where they had access to devices, they did not use them frequently for book reading, suggesting that paper book reading is still preferable for frequent book readers of both genders. 相似文献
40.